Botany MCQs for NEET — Practice Questions with Answers

The NCERT summary states: 'The proportion of different age groups of males and females in a population is often presented graphically as age pyramid; its shape indicates whether a population is stationary, growing or declining.'

The NCERT text notes: 'For instance, if a new habitat is just being colonised, immigration may contribute more significantly to population growth than birth rates.'

The NCERT text defines the components: '(iii) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.'

The NCERT explicitly uses Pacific salmon fish as an example of organisms that have evolved to breed only once in their lifetime, which is a life history trait reflecting an efficient reproductive strategy under particular selection pressures.

The NCERT text states: 'Evolution of life history traits in different species is currently an important area of research being conducted by ecologists.'

The NCERT text states that 'Saccharomyces cerevisiae... is used for fermenting malted cereals and fruit juices, to produce ethanol.' While sugarcane molasses and rice can be used, the provided context only explicitly lists malted cereals and fruit juices. Therefore, sugarcane molasses is not mentioned within this context.

The text explicitly states: 'For this purpose the same yeast Saccharomyces cerevisiae used for bread-making and commonly called brewer’s yeast, is used for fermenting malted cereals and fruit juices, to produce ethanol.' It is also called baker's yeast for bread making, but in the context of beverages, it's brewer's yeast.

The NCERT text clearly differentiates: 'Wine and beer are produced without distillation whereas whisky, brandy and rum are produced by distillation of the fermented broth.'

The text mentions, 'Similarly the dough, which is used for making bread, is fermented using baker’s yeast (Saccharomyces cerevisiae)'. This yeast is responsible for producing CO$_2$ through fermentation, leading to the puffed appearance.

The text states, 'Saccharomyces cerevisiae... is used for fermenting malted cereals and fruit juices, to produce ethanol.'